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Significant affairs

Due to the controlling and domineering nature of her husband Jin, Sun Kwon engaged in an affair with Jae Lee, a man whom she had met before her marriage to Jin. The affair was soon discovered by Mr. Paik, Sun's father, who chastised his daughter for the shame she had caused him after he walked in on Sun and Jae Lee. Paik, without Sun's knowledge, contacted Jin to kill Lee, though he did not reveal the affair. Though Jin severely beat Lee, he could not bring himself to kill him, instead warning him to leave Korea and go to America. Lee, believing that the affair had been discovered, instead committed suicide by jumping out of his hotel window and landing on Jin's car. At Lee's funeral, Paik confronted Sun, who was watching from afar. When questioned by Sun on whether or not he would inform Jin of the affair, he told her that it was not his place to do so. ("The Glass Ballerina")

Several weeks after crashing on the Island, Sun discovered that she was pregnant. Due to the fact that Jin was infertile, she worried that the baby might have been Jae Lee's. ("The Whole Truth") However, after a trip to the Staff with Juliet, she discovered that the baby did indeed belong to Jin, easing her worry. ("D.O.C.")

Several weeks later, after the arrival of the science team onto the Island, Sun, frustrated with the lack of answers she had been receiving, convinced Jin to accompany her in joining Locke's group. However, Juliet found out of her plans, and warned her that she would die in childbirth on the Island. Sun, however, did not heed Juliet's warnings, forcing Juliet to reveal Sun's affair to Jin in a last-ditch effort to get Sun to stay. Jin, hurt and angered, left to go on a fishing trip with Bernard, who restores Jin's faith in Sun through a conversation about marriage. Jin returned, forgiving Sun for the affair and showing that he was willing to start fresh. ("Ji Yeon")

Soon after her arrival on the Island, Juliet Burke struck up a friendship with Goodwin Stanhope, a fellow Other whom she first got to know by treating his chemical burn. The relationship between them soon evolved to something further, even though Goodwin was married to Harper, the Others' therapist. Benjamin Linus, who coveted Juliet, became suspicious of the affair after witnessing very friendly relations between Goodwin and Juliet. ("The Other Woman")

Harper soon discovered the affair, and confronted Juliet about it during a therapy session, telling her that she followed Goodwin and witnessed him and Juliet having sex. Harper warned Juliet that if the affair continued, there would be consequences, though not from her. She revealed that Ben, in his jealousy, might react extremely. ("The Other Woman")

Harper's suspicions were proven to be correct when, on September 22, 2004, Ben sent Goodwin to the tail section of Oceanic Flight 815 to create a list of survivors and to monitor them. Ben, aware that mission would be dangerous and possibly fatal, learned of Goodwin's death several weeks later due to impalement by Ana Lucia Cortez. He then took Juliet to see Goodwin's corpse, revealing that he had indeed planned Goodwin's death because he believed that Juliet belonged to him. ("The Other Woman")

Frustrated by her husband's need to fix everything, Sarah Shephard began having an affair with an unknown man. The affair remained secret from Jack until he revealed to Sarah that he had kissed Gabriela Busoni after the death of Gabriela's father, prompting Sarah to tell Jack that she had been unfaithful as well, and was in fact leaving Jack, leaving him heartbroken. ("The Hunting Party")

Jack became obsessed with discovering the identity of Sarah's lover, going so far as to begin stalking her in an attempt to find out who it was. He became increasingly paranoid, eventually believing her lover to be his own father, Christian Shephard, after finding Christian's name in Sarah's phone. Jack went so far as to publicly confront his father at an Alcoholics Anonymous meeting, eventually assaulting him. Sarah bailed Jack out of jail, but told him that Christian had only been calling her because he was worried about Jack. When Jack asked her who her lover was, she simply told him that "it doesn't matter who he is, it just matters who you're not." ("A Tale of Two Cities")

During his time spent incarcerated with the Others, Jack asked Juliet if his wife was truly happy with her lover, to which Juliet replied that she was. ("A Tale of Two Cities") After being rescued from the Island, Jack rescued a woman from a car crash and was taken to the emergency room, where he was met by Sarah, who was still his emergency contact. Sarah, visibly pregnant, refused Jack a ride home. ("Through the Looking Glass, Part 1")